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found: Wikipedia, April 21, 2016(Martin Hans Christian Knudsen; born February 15, 1871 in Hasmark; died May 27, 1949, Copenhagen; Danish physicist; taught and conducted research at the Technical University of Denmark; primarily known for his study of molecular gas flow and the development of the Knudsen cell, which is a primary component of molecular beam epitaxy systems; became lecturer in physics at the University in 1901, until his retirement in 1941; was also very active in physical oceanography)